Sleep sack alternative??

K
Hello all- my daughter is doing through the dreaded 4 month sleep regression right now and we are going on 1 month of this.  We have been working on a routine as far as naps and bedtime go.  We currently use a sleepsack but don't swaddle her arms in as she has started rolling.  She is very active and we will wake up to her slamming her feet down. I am wondering if the sleep sack is agitating her when she is trying to move about.  Does anyone recommend anything else to use instead of the sleepsack? I am also considering just having her sleep in her sleeper although I don't want her to be too cold either!